//// Copyright (C) 2004-2021 Artifex Software, Inc.
////
//// This file is part of MuPDF.
////
//// MuPDF is free software: you can redistribute it and/or modify it under the
//// terms of the GNU Affero General Public License as published by the Free
//// Software Foundation, either version 3 of the License, or (at your option)
//// any later version.
////
//// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
//// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
//// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
//// details.
////
//// You should have received a copy of the GNU Affero General Public License
//// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
////
//// Alternative licensing terms are available from the licensor.
//// For commercial licensing, see <https://www.artifex.com/> or contact
//// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
//// CA 94129, USA, for further information.
//
//#include "mupdf/fitz.h"
//
//#include "pixmap-imp.h"
//
//#include <jbig2.h>
//
//struct info
//{
//	int width, height;
//	int xres, yres;
//	int pages;
//	fz_colorspace *cspace;
//};
//
//struct fz_jbig2_allocator
//{
//	Jbig2Allocator super;
//	fz_context *ctx;
//};
//
//static void
//error_callback(void *data, const char *msg, Jbig2Severity severity, uint32_t seg_idx)
//{
//	fz_context *ctx = data;
//	if (severity == JBIG2_SEVERITY_FATAL)
//		fz_warn(ctx, "jbig2dec error: %s (segment %u)", msg, seg_idx);
//	else if (severity == JBIG2_SEVERITY_WARNING)
//		fz_warn(ctx, "jbig2dec warning: %s (segment %u)", msg, seg_idx);
//#ifdef JBIG2_DEBUG
//	else if (severity == JBIG2_SEVERITY_INFO)
//		fz_warn(ctx, "jbig2dec info: %s (segment %u)", msg, seg_idx);
//	else if (severity == JBIG2_SEVERITY_DEBUG)
//		fz_warn(ctx, "jbig2dec debug: %s (segment %u)", msg, seg_idx);
//#endif
//}
//
//static void *fz_jbig2_alloc(Jbig2Allocator *allocator, size_t size)
//{
//	fz_context *ctx = ((struct fz_jbig2_allocator *) allocator)->ctx;
//	return fz_malloc_no_throw(ctx, size);
//}
//
//static void fz_jbig2_free(Jbig2Allocator *allocator, void *p)
//{
//	fz_context *ctx = ((struct fz_jbig2_allocator *) allocator)->ctx;
//	fz_free(ctx, p);
//}
//
//static void *fz_jbig2_realloc(Jbig2Allocator *allocator, void *p, size_t size)
//{
//	fz_context *ctx = ((struct fz_jbig2_allocator *) allocator)->ctx;
//	if (size == 0)
//	{
//		fz_free(ctx, p);
//		return NULL;
//	}
//	if (p == NULL)
//		return Memento_label(fz_malloc(ctx, size), "jbig2_realloc");
//	return Memento_label(fz_realloc_no_throw(ctx, p, size), "jbig2_realloc");
//}
//
//static fz_pixmap *
//jbig2_read_image(fz_context *ctx, struct info *jbig2, const unsigned char *buf, size_t len, int only_metadata, int subimage)
//{
//	Jbig2Ctx *jctx = NULL;
//	Jbig2Image *page = NULL;
//	struct fz_jbig2_allocator allocator;
//	fz_pixmap *pix = NULL;
//
//	allocator.super.alloc = fz_jbig2_alloc;
//	allocator.super.free = fz_jbig2_free;
//	allocator.super.realloc = fz_jbig2_realloc;
//	allocator.ctx = ctx;
//
//	fz_var(jctx);
//	fz_var(page);
//	fz_var(pix);
//
//	fz_try(ctx)
//	{
//		jctx = jbig2_ctx_new((Jbig2Allocator *) &allocator, 0, NULL, error_callback, ctx);
//		if (jctx == NULL)
//			fz_throw(ctx, FZ_ERROR_LIBRARY, "cannot create jbig2 context");
//		if (jbig2_data_in(jctx, buf, len) < 0)
//			fz_throw(ctx, FZ_ERROR_LIBRARY, "cannot decode jbig2 image");
//		if (jbig2_complete_page(jctx) < 0)
//			fz_throw(ctx, FZ_ERROR_LIBRARY, "cannot complete jbig2 image");
//
//		if (only_metadata && subimage < 0)
//		{
//			while ((page = jbig2_page_out(jctx)) != NULL)
//			{
//				jbig2_release_page(jctx, page);
//				jbig2->pages++;
//			}
//		}
//		else if (only_metadata && subimage >= 0)
//		{
//			while ((page = jbig2_page_out(jctx)) != NULL && subimage > 0)
//			{
//				jbig2_release_page(jctx, page);
//				subimage--;
//			}
//
//			if (page == NULL)
//				fz_throw(ctx, FZ_ERROR_LIBRARY, "no jbig2 image decoded");
//
//			jbig2->cspace = fz_device_gray(ctx);
//			jbig2->width = page->width;
//			jbig2->height = page->height;
//			jbig2->xres = 72;
//			jbig2->yres = 72;
//		}
//		else if (subimage >= 0)
//		{
//			while ((page = jbig2_page_out(jctx)) != NULL && subimage > 0)
//			{
//				jbig2_release_page(jctx, page);
//				subimage--;
//			}
//
//			if (page == NULL)
//				fz_throw(ctx, FZ_ERROR_LIBRARY, "no jbig2 image decoded");
//
//			jbig2->cspace = fz_device_gray(ctx);
//			jbig2->width = page->width;
//			jbig2->height = page->height;
//			jbig2->xres = 72;
//			jbig2->yres = 72;
//
//			pix = fz_new_pixmap(ctx, jbig2->cspace, jbig2->width, jbig2->height, NULL, 0);
//			fz_unpack_tile(ctx, pix, page->data, 1, 1, page->stride, 0);
//			fz_invert_pixmap(ctx, pix);
//		}
//	}
//	fz_always(ctx)
//	{
//		jbig2_release_page(jctx, page);
//		jbig2_ctx_free(jctx);
//	}
//	fz_catch(ctx)
//	{
//		fz_drop_pixmap(ctx, pix);
//		fz_rethrow(ctx);
//	}
//
//	return pix;
//}
//
//int
//fz_load_jbig2_subimage_count(fz_context *ctx, const unsigned char *buf, size_t len)
//{
//	struct info jbig2 = { 0 };
//	int subimage_count = 0;
//
//	fz_try(ctx)
//	{
//		jbig2_read_image(ctx, &jbig2, buf, len, 1, -1);
//		subimage_count = jbig2.pages;
//	}
//	fz_catch(ctx)
//		fz_rethrow(ctx);
//
//	return subimage_count;
//}
//
//void
//fz_load_jbig2_info_subimage(fz_context *ctx, const unsigned char *buf, size_t len, int *wp, int *hp, int *xresp, int *yresp, fz_colorspace **cspacep, int subimage)
//{
//	struct info jbig2 = { 0 };
//
//	jbig2_read_image(ctx, &jbig2, buf, len, 1, subimage);
//	*cspacep = fz_keep_colorspace(ctx, jbig2.cspace);
//	*wp = jbig2.width;
//	*hp = jbig2.height;
//	*xresp = jbig2.xres;
//	*yresp = jbig2.yres;
//}
//
//fz_pixmap *
//fz_load_jbig2_subimage(fz_context *ctx, const unsigned char *buf, size_t len, int subimage)
//{
//	struct info jbig2 = { 0 };
//	return jbig2_read_image(ctx, &jbig2, buf, len, 0, subimage);
//}
//
//fz_pixmap *
//fz_load_jbig2(fz_context *ctx, const unsigned char *buf, size_t len)
//{
//	return fz_load_jbig2_subimage(ctx, buf, len, 0);
//}
//
//void
//fz_load_jbig2_info(fz_context *ctx, const unsigned char *buf, size_t len, int *wp, int *hp, int *xresp, int *yresp, fz_colorspace **cspacep)
//{
//	fz_load_jbig2_info_subimage(ctx, buf, len, wp, hp, xresp, yresp, cspacep, 0);
//}
